Punch



July 22, 1947. MacGREGOR I 2,424,474

PUNCH Filed Nov. 15, 1945 4 7a. 7 He. 5 I HQ. 6

' 701 INVENTOR.

Patented July 22, 1947 UNITED STATES. PATENT OFFICE PUNCH 7 PeterMacGregor, Detroit, Mich, assignor to. Ethel Mac t D tr it Mich.-

Anplication Noyeinber 15, 1945, Serial No. 628,764

This invention relates to a punch, and 'more particularly to a hollowpunch for piercing gaskets, belts, leather, paper, and any other softmaterial.

It is the object of this invention to provide a hollow punch comprisinga hollow handle or shank, and a hollow punch member removably nested andseated within said shank.

It is the further object of this invention to provide a hollow shank,with a removable punch having an inwardly tapered bore at its outer endpositioned and seated within the end of said shank.

It is the further object of this invention to provide the punchreceiving end of said shank radially yieldable, whereby said punchmember is slidably secured therein.

These and other objects will be seen from the following specificationsand claims in conjunction with the appended drawings of which:

Fig. 1 is an elevational section of the punch assembled.

Fig. 2 is an elevational view of the punch shank.

Fig. 3 is a right. end view thereof.

Fig. 4 is a left end view thereof.

Fig. 5 is an elevational view of the punch member.

Fig. 6 is a right end View thereof.

Fig. 7 is a left end view thereof, and

Fig. 8 is an elevational section of the punch inoperatively assembled.

It will be understood that the above drawing illustrates merely onepreferable embodiment of the invention, and that other embodiments arecontemplated within the scope of the claims hereafter set out.

Referring to the drawing the punch consists of the hollow shank orhandle II exteriorly knurled at l2 to provide a suitable grip.Cylindrical opening I3 therein terminates in offset cylindrical openingI4 of larger diameter providing annular punch seat I5.

The end of shank II corresponding to enlarged opening I4 is slotted orsplit at points IS, with said split portions extending longitudinallybeyond punch seat I5.

Thus, members I! corresponding to split openings l6 have a relativedegree of flexibility providing a friction grip for the base of punchmember I8 Figure 5 which is adapted to be slidably positioned and seatedtherein.

The outside diameter of punch member I8 at its widest portion slightlyexceeds the inside di- 2 ameter of opening l4, whereby the former isfrictionally retained within the latter.

The end of punch member I8 rests upon annular seat 15 in shank [I sothat longitudinal pressure or hammer blows delivered to the outer end ofsaid shank is transmitted to said punch member and to its sharpenedouter end I9.

It will be noted that punch member I8 has a hollow portion 20 joined bya hollow portion 2| of reduced diameter, which gradually converges ortapers towards the sharp cutting end I9.

Said tapered opening permits the punched out portions of the materialpunched, to gradually move along the interior of the punch without beingwedged within a limited portion thereof.

In operation manual longitudinal pressure may be exerted upon the punchshank II, or on the other hand, its outer end may be struck by a malletor hammer.

In the inventors preferable embodiment the shank as well as the punchmember are made of tool steel of spring temper throughout.

Referring to Figure 8 is seen that if desired, when not in use, punchmember I8 may be inverted and reinserted in shank I I with the sharpcutting end l9 positioned within said shank.

Punch member I8 being removable, it is seen that a plurality ofdifferent sized punches could be employed using the same shank.

Having described my invention, reference should now be had to the claimswhich follow for determining the scope thereof.

I claim:

1. A punch comprising a hollow shank having a split end with a portionof the opening therethrough adjacent said split end being of enlargeddiameter forming an annular ledge, and a hollow sharpened punch memberextending into said split end removably secured therein and seatedagainst said ledge, said split portion extending into the portion ofreduced interior diameter.

2. A punch comprising a, hollow shank having a plurality of spacedlongitudinal slots over a portion thereof to provide a flexible gripwith the portion of the opening therethrough corresponding to said gripbeing of enlarged diameter forming an annular seat, and a hollowsharpened punch member slidably nested within said grip and registeringwith said seat, said slots extending into the shank portion of reducedinterior diameter.

3. A punch comprising a hollow shank having a split end with a portionof the opening therethrough adjacent said split end being of an enlargeddiameter forming an annular ledge, and

a hollow sharpened punch member extending into said split end removablysecured therein and seated against said ledge, the outer diameter ofsaid punch member being slightly larger than the interior diameter ofthe split end of said shank for frictional retention therein.

4. A punch comprising a hollow shank having a split end with a portionof the opening therethrough adjacent said split end being of enlargeddiameter forming an annular ledge, and a hollow sharpened punch memberextending into said split end removably secured therein and seatedagainst said ledge, said split portion extending into the portion ofreduced interior diameter, the outer diameter of said punch membe beingslightly larger than the interior diameter of the split end of saidshank for frictional retention therein.

5. A punch comprising a hollow shank having a split end with a portionof the opening there- 4 through adjacent said split end being of emlarged diameter forming an annular ledge, and a hollow sharpened punchmember extending into said split end removably secured therein andseated against said ledge, said punch member being exteriorly taperedtowards its sharpened end whereby said end may be slidably insertedwithin said split end to bear against said ledge.

PETER MACGREGOR.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 952,570 Lamb Mar. 22, 1910682,613 Hall Sept. 17, 1901 2,087,186 Freeman July 13, 1937 20 2,266,393Hoifman Dec. 16, 1941

